Yes, by using COALESCE.
SELECT COALESCE(null_column, 0) AS null_column FROM whatever;
COALESCE goes through the list of values you give it, and returns the first non-null value.
Top answer 1 of 6
140
Yes, by using COALESCE.
SELECT COALESCE(null_column, 0) AS null_column FROM whatever;
COALESCE goes through the list of values you give it, and returns the first non-null value.
2 of 6
104
I am adding this answer because no one mentioned IFNULL function
You can use IFNULL
SELECT IFNULL(column_name, 0) FROM table_name;
IFNULL will return column's value (if it has something other than NULL) otherwise second parameter passed (in this case 0).
W3Schools
w3schools.com › mysql › mysql_ifnull.asp
MySQL IFNULL() and COALESCE() Functions
... The "InOrder" column is optional, and may contain NULL values. ... Note: In the SQL above, if any of the "InOrder" values are NULL, the result will be NULL! The COALESCE() function is the preferred standard for handling potential NULL values.
Coalesce function still showing null values in mysql query
If both arguments are NULL, the result will be NULL. https://dbfiddle.uk/NWQm6-zH More on reddit.com
7
0
August 25, 2023mysql - COALESCE returning NULL when there are no records - Database Administrators Stack Exchange
When running the following query on a device_id that has no entries in the inv_zfs_replication table the result is a NULL value. How can I make the 2nd sub-query return a zero if there aren't any r... More on dba.stackexchange.com
Replace null count with a zero (0)
Look into IFNULL(thing, 0) More on reddit.com
22
15
December 22, 2022sql - MySQL, coalesce equivalent for empty values? - Stack Overflow
So ORDER BY COALESCE(NULLIF(FIELD(mycolumn, 'A', 'B', 'C'),0),999999999). I've been looking for an elegant way to do this for a long time, and here it is. Answer is years old, but I never saw it before... 2019-09-11T18:38:27.743Z+00:00 ... There's no boolean in SQL, or MySQL. More on stackoverflow.com
DataCamp
datacamp.com › doc › mysql › mysql-coalesce
MySQL COALESCE Expression: Usage & Examples
The `COALESCE` expression is used ... COALESCE(expression1, expression2, ..., expressionN) In this syntax, each `expression` is evaluated in sequence until a non-null value is found, which is then returned....
TutorialsPoint
tutorialspoint.com › how-to-convert-mysql-null-to-0-using-coalesce-function
How to convert MySQL null to 0 using COALESCE() function?
July 30, 2019 - mysql> select coalesce(Salary,0) as `CONVERT_NULL _TO_0` from convertNullToZeroDemo;
MySQL Tutorial
mysqltutorial.org › home › mysql comparison functions › mysql coalesce function
MySQL COALESCE Function
October 10, 2023 - In case all arguments are NULL, the COALESCE function returns NULL. The following illustrates the COALESCE function syntax: COALESCE(value1,value2,...);Code language: SQL (Structured Query Language) (sql) ...
Baeldung
baeldung.com › home › sql basics › how to replace null with 0 in sql
How to Replace NULL With 0 in SQL Baeldung on SQL
January 27, 2025 - We can use the COALESCE function to replace NULL values with 0. The COALESCE function is a standard SQL function that finds and returns the first non-NULL value from its argument list.
TutorialsPoint
tutorialspoint.com › convert-mysql-null-to-0
Convert MySQL null to 0?
July 30, 2019 - Use IFNULL or COALESCE() function in order to convert MySQL NULL to 0. The syntax is as follows SELECT IFNULL(yourColumnName,0) AS anyAliasName FROM yourTableName; The second syntax is as follows: SELECT CO
Reddit
reddit.com › r/mysql › coalesce function still showing null values in mysql query
r/mysql on Reddit: Coalesce function still showing null values in mysql query
August 25, 2023 -
I am currently practicing sql queries and am trying to omit any nulls from the product column in this data table. I tried to replace those values with their product codes using the coalesce function but they are still showing up after I run the query. Did I miss a step?
Here is my query:
SELECT
COALESCE(product, product_code) AS new_product
FROM
laurens_furniture_table
Top answer 1 of 4
3
If both arguments are NULL, the result will be NULL. https://dbfiddle.uk/NWQm6-zH
2 of 4
1
The step you missed is where you didn't give enough detail on your question. Like show some data examples as well as the desired output versus the undesired output that you're getting instead.
w3resource
w3resource.com › mysql › comparision-functions-and-operators › coalesce-function.php
MySQL COALESCE() function - w3resource - w3resource
March 3, 2026 - MySQL COALESCE() function returns the first non-NULL value of a list, or NULL if there are no non-NULL values. ... It allows you to set a default value when a field is NULL.
MySQL
dev.mysql.com › doc › en › comparison-operators.html
MySQL :: MySQL 8.4 Reference Manual :: 14.4.2 Comparison Functions and Operators
This operator performs an equality comparison like the = operator, but returns 1 rather than NULL if both operands are NULL, and 0 rather than NULL if one operand is NULL. The <=> operator is equivalent to the standard SQL IS NOT DISTINCT FROM operator.
Quora
quora.com › How-do-you-replace-null-values-with-0-in-SQL
How to replace null values with 0 in SQL - Quora
Answer (1 of 5): The simplest thing would be in a stored procedure. When you are defining the parameters you would just add “= 0”. This will be the default value if nothing or null is sent to the procedure.
TablePlus
tableplus.com › blog › 2019 › 09 › sql-if-null-then-0.html
SQL IF NULL THEN 0 | TablePlus
September 11, 2019 - Run this SELECT … COALESCE … statement to return 0 as the alternative value when bonus value is NULL: SELECT emp_no, salary, from_date, to_date, COALESCE(bonus, 0) FROM salaries; In MySQL you can also use IFNULL function to return 0 as the alternative for the NULL values:
DB Vis
dbvis.com › thetable › isnull-vs-coalesce-comparing-null-handling-functions
ISNULL vs COALESCE: Comparing NULL Handling Functions
August 6, 2025 - Returns 0 if expression is not NULL. Note: To replace NULL values in MySQL as in the SQL Server ISNULL function, you need to use the MySQL IFNULL function instead. The SQL COALESCE function returns the first non-NULL value from a list of SQL ...
Top answer 1 of 3
2
Scalar subqueries that return no rows have a return "value" of NULL ... so all you need to do is coerce that NULL to a 0 directly outside the subquery with IFNULL():
SELECT
(
(
SELECT
SUM(s.quota)
FROM
`inv_zfs_share` s
JOIN `inv_zfs_project` p2 ON s.project_id = p2.id
WHERE
p2.device_id = p.device_id
GROUP BY
p2.pool_id
) +
IFNULL( -- add this, here
(
SELECT
SUM(quota)
FROM
inv_zfs_replication
WHERE
device_id = p.device_id
GROUP BY
pool_id
)
,0) -- and add this, here
) AS 'Quota Total'
FROM
inv_zfs_pool p
WHERE
p.device_id = 626;
2 of 3
2
Put it outside. I think it will work
SELECT COALESCE(
(
SELECT SUM(quota)
FROM
inv_zfs_replication
WHERE
device_id = p.device_id
GROUP BY
pool_id),0) AS 'Quota Total'
Reddit
reddit.com › r/sql › replace null count with a zero (0)
r/SQL on Reddit: Replace null count with a zero (0)
December 22, 2022 -
Hello,
This is my query
SELECT ordertype, status, sum (COUNT (printdate)) over (), date(char(1900000+requestdate)), businessunit FROM Casepallet WHERE date(char(1900000+requestdate)) IN (current date, current date + 1 days) AND business unit=' SCS' AND ordertype!='T1' AND status = 'X' group by ordertype, business unit, request date, status, printdate order by printdate desc limit 1
Sometimes the sum/count of printdate returns nothing, it's null. If it's null I want it to return 0.
I tried doing it like this: COALESCE (sum (COUNT (printdate)) over (), 0), but it doesn't work, it still returns null.
Can anyone guide me here on where I go wrong?
Top answer 1 of 5
7
Look into IFNULL(thing, 0)
2 of 5
2
Sometimes the sum/count of printdate returns nothing, it's null. what times are those? can you isolate these cases and give the details on the underlying data that causes this? This should not happen unless there's a bug someplace (count() is never null, if there's any non-null record fed into sum the result wont be null).
Top answer 1 of 4
251
You could make NULL from empty string in MySQL:
SELECT coalesce(NULLIF(email, ''), '[email protected]') FROM users WHERE id=1000000;
2 of 4
15
Use the ANSI CASE statement/expression:
SELECT CASE
WHEN LENGTH(col) = 0 OR col IS NULL THEN 'banana'
ELSE col
END AS fruit
There's no boolean in SQL, or MySQL. MySQL actually stores the value as an INT, values zero or one:
SELECT CASE
WHEN col = 0 THEN 'banana'
ELSE col
END AS fruit
CastorDoc
castordoc.com › how-to › how-to-use-coalesce-in-mysql
How to use coalesce in MySQL?
The syntax for using coalesce in MySQL is:COALESCE(expr1, expr2, ... , exprn) Here, expr1, expr2, ..., exprn are the expressions that coalesce will evaluate sequentially until a non-NULL value is found.
Reddit
reddit.com › r/mysql › replacing null values with 0
r/mysql on Reddit: Replacing null values with 0
August 24, 2022 -
If I do a MySQL statement like:
SELECT DATE(`date_created`) AS created_date, COUNT(*) AS s_count FROM `sample_table` WHERE subject not LIKE '%Blue%' GROUP BY `created_date` ORDER BY created_date DESC
Then it will return a table such as:
https://i.imgur.com/0mwgG1I.png
You will notice that the date starts at 22nd August. That is because the 23rd August had no entries that matched the statement.
Is it possible to rewrite the statement to include the 23rd August? It would need to have a 0 in the s_count column.
Thanks.
Top answer 1 of 3
5
If you're using MySQL 8, then you could combine your query with this one to make it work: WITH RECURSIVE nrows(xdate) AS ( SELECT MAKEDATE(2022,DAYOFYEAR('2022-08-01')) UNION ALL SELECT DATE_ADD(xdate, INTERVAL 1 DAY) FROM nrows WHERE xdate <= CURRENT_DATE ), data as ( SELECT DATE(`date_created`) AS created_date, COUNT(*) AS s_count FROM `sample_table` WHERE subject not LIKE '%Blue%' GROUP BY `created_date` ) SELECT * FROM nrows LEFT JOIN data on nrows.xdate = data.created_date This is essentially using a recursive CTE to generate all of the dates in the month to a temp table (nrows). You join your table on this table and all results from your table with a date will join, everything else will have a null value (which you could just make zero with COALESCE or some other formatting function). In the DAYOFYEAR() function, enter whatever starting date you want.
2 of 3
1
Is it possible to rewrite the statement to include the 23rd August? is that the only date you're concerned about? it's also missing August 13th and a bunch more
W3Schools
w3schools.com › sql › sql_isnull.asp
SQL COALESCE(), IFNULL(), ISNULL(), NVL() Functions
The COALESCE() function returns the first non-NULL value in a list of values. The COALESCE() function works in MySQL, SQL Server, and Oracle (not in MS Access).